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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .bigBox{
            margin-top: 200px;
            position: relative;
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        .box{
            width: 200px;
            text-align: center;
            line-height: 50px;
            border-radius: 8px;
            height: 50px;
            border: 1px solid #ccc;
            box-sizing: border-box;            
            cursor: pointer;
           
        }
        .after p{
            width: 200px;
            text-align: center;
            line-height: 50px;
            border-radius: 8px;
            height: 50px;
            border: 1px solid #ccc;
            box-sizing: border-box;
            cursor: text;
            margin: 0;
        }
        .after{
            padding-bottom: 50px;
            position: absolute;
            top: -100px;
            display: none;
        }
        .box:hover+.after {
            display: block !important;
        }
        .after:hover{
            display: block;
        }
    </style>
</head>
<body>
    <div class="bigBox">
        <div class="box">江城闲适自在的豆干</div>
        <div class="after">
            <p>XXXXXXjdgfusdhj</p>
        </div>
    </div>
</body>
</html>
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